To answer this question, let's go through each option to understand why it is correct or incorrect:
Option A) for Backup/Recovery - This option is correct because the EXPORT/IMPORT command is commonly used in database management systems for backup and recovery purposes. The EXPORT command allows you to extract data and database objects into a file, which can then be used for backup or recovery. The IMPORT command allows you to restore the exported data and objects back into the database.
Option B) for increasing the speed - This option is incorrect because the EXPORT/IMPORT command is not used for increasing the speed of a system. It is primarily used for backup and recovery purposes.
Option C) for file backup - This option is incorrect because while the EXPORT/IMPORT command can be used for backup purposes, it is specifically used for database backup, not file backup. The command is used to export database data and objects, not individual files.
Option D) All of the above - This option is incorrect because only option A (for Backup/Recovery) is correct. The EXPORT/IMPORT command is not used for increasing the speed or file backup.
The correct answer is A) for Backup/Recovery. This option is correct because the EXPORT/IMPORT command is commonly used in database management systems for backup and recovery purposes.